How do I break this image up in Inkscape?

I have an SVG (located here: http://www.tastylime.net/misc/panels-example.svg ) which is output by Fusion 360 using the 'Glowforge' exporter. I'd like to be able to edit it in Inkscape to move the individual panels separately to get better placement, and/or to color them differently so I can make the cuts in a particular order in the Glowforge.

I use Inkscape 0.92.2, which is the latest build available for the Mac.

I've tried Object->Ungroup, Path->Break Apart and Path->Object to Path, but none of them seem to do anything with this single object that shows up. Is there anything I can do with Inkscape to allow me to move these panels around? I can try different exporters (I've had a little better success with a DXF), but most of the time this SVG is what I want; it's only sometimes I need to edit it after export.